Local Anesthesia practice questions WREB fully solved

Local Anesthesia practice questions WREBThe patient has been occasionally experiencing tightening of the chest for the past 3 years, but such symptoms did not appear for at least 7 months. In this case, the MRD for levonordefrin is: - correct answer 0.2 mg Healthy= 1 mg cardiac= 0.2 mg Lidocaine 1:100,000 has ___ the amount of epinephrine compared t0 lidocaine 1:50,000. - correct answer 1/2 1:100,000= 0.018mg 1:50,000= 0.036mg Whats is the maximum recommended dosage (MRD) of epinephrine for healthy adults? - correct answer 0.2mg How much epinephrine is there in one cartridge of 2% lidocaine 1:100,000? - correct answer 0.018mg Whats Is the maximum recommended dosage (MRD) of epinephrine for a patient with hypertension? - correct answer 0.04mg *healthy=0.2mg cardiovascular disease= 0.04mg The amount of epinephrine given to two cartridges of 2% Lidocaine 1:100,000 is - correct answer 0.036mg 1:100,000= 0.018mg 2 x 0.018= 0.036 Amount of Epinephrine: 1:20,000 1:50,000 1:100,000 1:200,000 - correct answer 1:20,000= 0.09mg 1:50,000= 0.036mg 1:100,000=0.018 1:200,000=0.009 You administered 200mg of 3% mepivacaine plain to a patient. Now you would like to switch to 2% lidocaine 1:100,000. What is the maximum dose of lidocaine that you can give?(patient is 170lbs and there is no other medical conditions other than occasional asthma) - correct answer 200mg STEP 1: MRD for each local anesthetic MRD for 3% mepivacaine plain; 400mg (patient over 150lb) MRD for 2% lidocaine; 500mg (patient over 150lb) STEP 2: How many cartridges are needed to create an equivalent amount of local anesthetic to the MRD according to the patient weight? 3% mepi : 400mg / 54mg= 7.4cartridges (30mg/ml x 1.8ml = 54mg) 2%lido: 500mg / 36mg = 13.8 cartridges (20mg/ml x 1.8ml= 36mg) STEP 3: MRD for epi= 0.2mg healthy STEP 4: Cartridges needed to create an amount of epi equivalent to the epi MRD according to the patients health? divide MRD by amount of epi in one cartridge 0.2mg/ 0.018mg=11.1 cartridges. STEP 5: among 3 MRD's for cartridges, which is the lowest? 7.4 vs 13.8 vs 11.1 cartridges. Lowest is 7.4 cartridges of mepi. 400mg is limiting factor 200mg was already given and the MRD is 400mg, 200mg more of lidocaine can be administered How much epinephrine is in one cartridge of 2% lidocaine 1:50,000? - correct answer 0.036mg 0.02x1.8ml=